Matrix: HB/fs_183_6

Description: UNSYMMETRIC FACSIMILE CONVERGENCE MATRIX

HB/fs_183_6 graph HB/fs_183_6 graph
(bipartite graph drawing) (graph drawing of A+A')


HB/fs_183_6 dmperm of HB/fs_183_6

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  • Matrix group: HB
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  • download as a MATLAB mat-file, file size: 7 KB. Use UFget(144) or UFget('HB/fs_183_6') in MATLAB.
  • download in Matrix Market format, file size: 9 KB.
  • download in Rutherford/Boeing format, file size: 8 KB.

    Matrix properties
    number of rows183
    number of columns183
    nonzeros1,000
    structural full rank?yes
    structural rank183
    # of blocks from dmperm37
    # strongly connected comp.37
    explicit zero entries69
    nonzero pattern symmetry 42%
    numeric value symmetry 0%
    typereal
    structureunsymmetric
    Cholesky candidate?no
    positive definite?no

    authorA. Curtis
    editorI. Duff, R. Grimes, J. Lewis
    date1983
    kindsubsequent 2D/3D problem
    2D/3D problem?yes

    Notes:

    next: - first: HB/fs_183_1
    

    Ordering statistics:result
    nnz(chol(P*(A+A'+s*I)*P')) with AMD1,065
    Cholesky flop count7.8e+03
    nnz(L+U), no partial pivoting, with AMD1,947
    nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD3,981
    nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD7,282

    Note that all matrix statistics (except nonzero pattern symmetry) exclude the 69 explicit zero entries.

    SVD-based statistics:
    norm(A)1.18084e+09
    min(svd(A))0.00679901
    cond(A)1.73678e+11
    rank(A)183
    sprank(A)-rank(A)0
    null space dimension0
    full numerical rank?yes

    singular values (MAT file):click here
    SVD method used:s = svd (full (A)) ;
    status:ok

    HB/fs_183_6 svd

    For a description of the statistics displayed above, click here.

    Maintained by Tim Davis, last updated 12-Mar-2014.
    Matrix pictures by cspy, a MATLAB function in the CSparse package.
    Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.